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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 14 May 2010 (Friday) 20:17
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how do I shoot 8 fps on the 7D ?

 
Viva-photography
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May 16, 2010 11:12 |  #16

you camera also must be in manual focus to hit 8fps




  
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msowsun
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May 16, 2010 11:21 |  #17

One thing that can slow down any EOS camera is shooting with older Arc Form Drive lenses in AI Servo.

I just received an answer explaining this interesting effect with older Canon lenses. Here is my question and his answer:

THE DIGITAL JOURNALIST
Tech Tips
June 2008
by Chuck Westfall


http://digitaljournali​st.org …tips.html#comme​nt-2234509 (external link)

I have recently noticed that my older EF Arc-Form Drive lenses will cause the frame rate to drop to about 4fps on my 40D when shooting in "AI SERVO". Even with a stationary subject and the camera on a tripod.

This doesn't happen in "ONE SHOT". In "AI FOCUS" I will get 6.5fps, but as soon as the subject moves, it again slows to 4ps or less.

Can you please explain why this is so?

Mike Sowsun



Except for the EF80-200mm f/2.8L and EF20-35mm f/2.8L, all other EF lenses with AFD (Arc Form Drive) focusing motors were designed in such a way that autofocusing and diaphragm operation (via the Electromagnetic Diaphragm, or EMD for short) were carried out sequentially rather than simultaneously. This has no impact on continuous sequences in One-Shot AF, because no autofocusing occurs after the initial AF lock in this mode. But in AI Servo, both the focus and the diaphragm are operated for each photo, and consequently the camera's framing rate decreases.

For what it's worth, AFD motors were phased out of the EOS system for all new lenses introduced from 1990 onwards.

Best Regards--Chuck Westfall

The other thing that slows down the 7D is shooting in very low light. https://photography-on-the.net/forum/showthre​ad.php?t=759335

---------------

This only happens in very low light conditions. Similar to a dimly lit room in a house at night. Maybe a large room lit by one 60 watt bulb. The exposure where this fps reduction starts to appear is roughly 1/100 f/2.8 at ISO 3200.

Under these lighting conditions raising the ISO to 6400 or even 12800 will not help. It is the available light that the camera meter sees, not the shutter speed that causes the reduction in fps.

In addition to Liveview, another solution is to meter a brighter scene using Tv or Av and then press the * button for AE Lock. This stops the metering system and allows the camera to shoot 8fps again. (the * button doesn't work in Manual mode so don't bother trying it in Manual)

Liveview and AE Lock are not very good workarounds, but it is possible to shoot 8fps in low light. I suspect Canon might be able to address this in a future Firmware upgrade.


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PixxByTango
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May 16, 2010 11:22 |  #18

Viva-photography wrote in post #10190278 (external link)
you camera also must be in manual focus to hit 8fps

Not true.


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msowsun
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May 16, 2010 11:33 |  #19

Viva-photography wrote in post #10190278 (external link)
you camera also must be in manual focus to hit 8fps

PixxByTango wrote in post #10190317 (external link)
Not true.

Agreed. I can get 8fps in AF. So should anyone.


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Viva-photography
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May 16, 2010 11:36 |  #20

Agreed. I can get 8fps in AF. So should anyone.

hahaha. maybe I should stop shooting in bad light. :p




  
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mikekelley
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May 16, 2010 11:44 |  #21

no no.you have to depress the shutter 8 times per second to get it to shoot 8 times per second. you can't just hold it down.


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wask_
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May 16, 2010 11:45 |  #22

silvrr wrote in post #10183058 (external link)
QUOTED IMAGE

Well, since he's asking he probably downloaded a cracked version of the 7d. I heard no books come with it.


- 7D -
Σ 30 f/1.4 | 50 f/1.8

  
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Magnus3D
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May 16, 2010 11:51 |  #23

Hehehe funny thread :D i like it!

Yeah the manual is great when you wanna know how your precious 7D works, try it it actually works! :)

/ Magnus


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shedberg
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May 16, 2010 13:14 |  #24

Thanks to the internet, I downloaded, printed, and read the manual before my camera even arrived! LOL

The 7D manual is a great resource, read it through. Then read it through again, and again, and again...


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how do I shoot 8 fps on the 7D ?
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